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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - Stock Options - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Shares
Outstanding (in shares)	3,238	3,499	3,278
Granted (in shares)	0	0	694
Exercised (in shares)	(201)	(217)	(375)
Forfeited/Expired (in shares)	(174)	(44)	(98)
Outstanding (in shares)	2,863	3,238	3,499
Exercisable (in shares)	2,516	2,482	2,193
Weighted-Average Exercise Price
Outstanding (in dollars per share)	$ 60.86	$ 58.62	$ 56.41
Granted (in dollars per share)	0	0	59.03
Exercised (in dollars per share)	38.02	24.46	36.88
Forfeited/expired (in dollars per share)	61.76	62.14	70.77
Outstanding (in dollars per share)	62.41	60.86	58.62
Exercisable at the end of the period (in dollars per share)	$ 62.38	$ 60.38	$ 56.31

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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